From fb997fec6dfa94f9b9f5ef25aa6e41a084514301 Mon Sep 17 00:00:00 2001
From: Bobbi Webber-Manners <bobbi.manners@gmail.com>
Date: Sun, 24 Oct 2021 17:02:12 -0400
Subject: [PATCH] Reworked ROM menu to use sideways ROM loading.

---
 applecorn.po   | Bin 819200 -> 819200 bytes
 auxmem.init.s  |   4 +-
 auxmem.misc.s  |  97 ++++++++++++++++++++++++++++++++++++++++++++++++-
 mainmem.ldr.s  |   8 ++--
 mainmem.menu.s |  74 +------------------------------------
 5 files changed, 104 insertions(+), 79 deletions(-)

diff --git a/applecorn.po b/applecorn.po
index 22c6b883f93a90e0d48bea52627bbdf446342c81..5ebb4e8773c644ca8533b88422f64311ff08c095 100644
GIT binary patch
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diff --git a/auxmem.init.s b/auxmem.init.s
index 1c7c2cb..cb8427f 100644
--- a/auxmem.init.s
+++ b/auxmem.init.s
@@ -7,7 +7,7 @@
 * BBC Micro 'virtual machine' in Apple //e aux memory
 ***********************************************************
 
-MAXROM      EQU   $00                        ; Only one sideways ROM
+MAXROM      EQU   $00                        ; Just one ROM
 
 ZP1         EQU   $90                        ; $90-$9f are spare Econet space
                                              ; so safe to use
@@ -125,6 +125,8 @@ MOSHIGH     SEI
             DEX
             BPL   :INITPG2
 
+            JSR   INITROMS                   ; Initialize sideways ROM table
+
             JSR   KBDINIT                    ; Returns A=startup MODE
             JSR   VDUINIT                    ; Initialise VDU driver
             JSR   PRHELLO
diff --git a/auxmem.misc.s b/auxmem.misc.s
index 21465be..3f36f8f 100644
--- a/auxmem.misc.s
+++ b/auxmem.misc.s
@@ -327,15 +327,108 @@ RDROM       LDA   $F4
 * X=ROM to select
 * All registers must be preserved
 ROMSELECT   CPX   $F4
-            BNE   :ROMSELOK       ; Already selected
+            BEQ   :ROMSELOK       ; Already selected
 
 * Insert code here for faking sideways ROMs by loading or otherwise
 * fetching code to $8000. All registers must be preserved.
-
+            PHA
+            PHX
+            PHY
+            TXA
+            ASL   A
+            TAX
+            LDA   ROMTAB,X        ; LSB of pointer to name
+            STA   OSFILECB+0
+            LDA   ROMTAB+1,X      ; MSB of pointer to name
+            STA   OSFILECB+1
+            STZ   OSFILECB+2      ; Dest address $8000
+            LDA   #$80
+            STA   OSFILECB+3
+            LDX   #<OSFILECB
+            LDY   #>OSFILECB
+            LDA   #$FF            ; Means 'LOAD'
+            JSR   OSFILE
+            PLY
+            PLX
+            PLA
             STX   $F4             ; Set Current ROM number
 :ROMSELOK
 EVENT       RTS
 
+BASICROM    ASC   'BASIC2.ROM'
+            DB    $0D,$00
+
+COMALROM    ASC   'COMAL.ROM'
+            DB    $0D,$00
+
+LISPROM     ASC   'LISP501.ROM'
+            DB    $0D,$00
+
+FORTHROM    ASC   'FORTH103.ROM'
+            DB    $0D,$00
+
+PROLOGROM   ASC   'MPROLOG310.ROM'
+            DB    $0D,$00
+
+BCPLROM     ASC   'BCPL7.0.ROM'
+            DB    $0D,$00
+
+PASCROM1    ASC   'USERROM2.ROM'
+            DB    $0D,$00
+
+PASCROM2    ASC   'USERROM1.ROM'
+            DB    $0D,$00
+
+* Initialize ROMTAB according to user selection in menu
+INITROMS    STA   $C002           ; Read main mem
+            LDA   USERSEL
+            STA   $C003           ; Read aux mem
+            ASL                   ; x2
+            CLC
+            ADC   #<ROMS
+            STA   OSLPTR+0
+            LDA   #>ROMS
+            ADC   #$00
+            STA   OSLPTR+1
+            LDY   #$00
+            LDA   (OSLPTR),Y
+            STA   ROMTAB+0
+            INY
+            LDA   (OSLPTR),Y
+            STA   ROMTAB+1
+            LDA   #$FF
+            STA   $F4             ; Force ROM to load
+            RTS
+
+* Active sideways ROMs
+ROMTAB      DW    $0000           ; ROM0
+            DW    $0000           ; ROM1
+            DW    $0000           ; ROM2
+            DW    $0000           ; ROM3
+            DW    $0000           ; ROM4
+            DW    $0000           ; ROM5
+            DW    $0000           ; ROM6
+            DW    $0000           ; ROM7
+            DW    $0000           ; ROM8
+            DW    $0000           ; ROM9
+            DW    $0000           ; ROMA
+            DW    $0000           ; ROMB
+            DW    $0000           ; ROMC
+            DW    $0000           ; ROMD
+            DW    $0000           ; ROME
+            DW    $0000           ; ROMF
+
+* ROM filenames in same order as in the menu
+* ROMMENU copies these to ROMTAB upon user selection
+ROMS        DW    BASICROM
+            DW    COMALROM
+            DW    LISPROM
+            DW    FORTHROM
+            DW    PROLOGROM
+            DW    BCPLROM
+            DW    PASCROM1
+            DW    PASCROM2
+
 *EVENT       LDA   #<OSEVENM
 *            LDY   #>OSEVENM
 *            JMP   PRSTR
diff --git a/mainmem.ldr.s b/mainmem.ldr.s
index fa3f477..49fd71f 100644
--- a/mainmem.ldr.s
+++ b/mainmem.ldr.s
@@ -17,10 +17,10 @@ START       JSR   CROUT
             TRB   $C035
 
             JSR   ROMMENU
-            LDA   #>AUXADDR        ; Address in aux
-            LDX   #<AUXADDR
-            SEC                    ; Load into aux
-            JSR   LOADCODE         ; Load lang ROM
+*            LDA   #>AUXADDR        ; Address in aux
+*            LDX   #<AUXADDR
+*            SEC                    ; Load into aux
+*            JSR   LOADCODE         ; Load lang ROM
 
             LDA   #<:FDFILE
             STA   OPENPL+1
diff --git a/mainmem.menu.s b/mainmem.menu.s
index f9fb9b5..b9c93da 100644
--- a/mainmem.menu.s
+++ b/mainmem.menu.s
@@ -44,12 +44,7 @@ ROMMENU     JSR   HOME        ; Clear screen
             BCC   :KEYOK
             JSR   BELL        ; Invalid - beep
             BRA   :KEYIN      ; Go again
-:KEYOK      ASL               ; x2
-            TAX
-            LDA   ROMTBL,X    ; Fetch ROM filename ...
-            STA   OPENPL+1    ; ... and put in MLI OPEN PL
-            LDA   ROMTBL+1,X
-            STA   OPENPL+2
+:KEYOK      STA   USERSEL     ; Record selection
             RTS
 
 * Print a string pointed to by A1L/A1H
@@ -78,94 +73,29 @@ MSGTBL      DW    MSG1
             DW    MSG7
             DW    MSG8
 
-ROMTBL      DW    ROM1
-            DW    ROM2
-            DW    ROM3
-            DW    ROM4
-            DW    ROM5
-            DW    ROM6
-            DW    ROM7
-            DW    ROM8
-
 MSG1        ASC   " 1. BBC BASIC"
             DB    $00
-ROM1        STR   "BASIC2.ROM"
 
 MSG2        ASC   " 2. Acornsoft COMAL"
             DB    $00
-ROM2        STR   "COMAL.ROM"
 
 MSG3        ASC   " 3. Acornsoft Lisp"
             DB    $00
-ROM3        STR   "LISP501.ROM"
 
 MSG4        ASC   " 4. Acornsoft Forth"
             DB    $00
-ROM4        STR   "FORTH103.ROM"
 
 MSG5        ASC   " 5. Acornsoft MicroProlog"
             DB    $00
-ROM5        STR   "MPROLOG310.ROM"
 
 MSG6        ASC   " 6. Acornsoft BCPL"
             DB    $00
-ROM6        STR   "BCPL7.0.ROM"
 
 MSG7        ASC   " 7. USERROM1.ROM"
             DB    $00
-ROM7        STR   "USERROM1.ROM"
 
 MSG8        ASC   " 8. USERROM2.ROM"
             DB    $00
-ROM8        STR   "USERROM2.ROM"
-
-
-
-
-
-
-
-
-
-
-
-
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+USERSEL     DB    $00